#include <iostream>
using namespace std;
enum color{red, yellow, blue};
void display(color a)
{
	switch(a)
	{
		case red:
		cout << "read\n";
		break;
		case yellow:
		cout << "yellow\n";
		break;
	    case blue:
	    cout << "blue\n";
	    break;
	}
}

int main()
{
	color a = red;
	display(a);
	return 0;
}
